Added a gemspec to gemify EnvJasmine. This required adding a ruby script for running a test and also involved changing the default for normalizing file paths to be the projectRoot instead of the rootDir of EnvJasmine
envjs_run_test will now return a failing exit code
'projectRoot' is now 'rootDir'

This seeks to correct the issue pointed out by trevmex in lolindrath's
pull request 28.
Merge pull request #30 from mdb/rubygem

Rubygem